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create table my_backup_table as (select * from my_table);

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# 1- ver qual a rota do docker com o comando
route

# 2- remover a rota
sudo route del -net 172.17.0.0 netmask 255.255.0.0

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# to list all ports that are used
sudo netstat -ntlp | grep LISTEN

# you can obtain a specific port using the following command
sudo netstat -ntlp | grep :8080

# when you execute the command above you will see something like that
tcp        0      0 0.0.0.0:27370           0.0.0.0:*               LISTEN      4394/skype      
tcp        0      0 127.0.1.1:53            0.0.0.0:*               LISTEN      2216/dnsmasq    
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      4912/cupsd      

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# Usage: watch [-dhntv] [--differences[=cumulative]] [--help] [--interval=<n>] [--no-title] [--version] <command>
#  -d, --differences[=cumulative]        highlight changes between updates
#                (cumulative means highlighting is cumulative)
#  -h, --help                            print a summary of the options
#  -n, --interval=<seconds>              seconds to wait between updates
#  -v, --version                         print the version number
#  -t, --no-title                        turns off showing the header
#
#
# example:

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# %APPENGINE_HOME%/appcfg.sh update "WAR_PATH"
# Enter your Google username and password at the prompts.
# see: https://developers.google.com/appengine/docs/java/gettingstarted/uploading
/opt/appengine-java-sdk-1.8.0/bin/appcfg.sh update target/gae-springmvc-template-0.0.1-SNAPSHOT

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Este comando efetua a cópia de dados entre duas tabelas dentro de um mesmo banco, ou entre bancos diferentes.
Muito útil para equalizar dados para testes, simulações de erros, etc...

A sintaxe é:
    
    COPY FROM <db> TO <db> <opt> <tbl> {<<cls>>} USING <sel>
    
    Onde:
    <db> : string de banco de dados, ex.: usuário/senha@banco1
    <opc>: Uma das palavras chaves: APPEND, CREATE, INSERT ou REPLACE

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# To use cron for tasks meant to run only for your user profile, add entries to 
# your own user's crontab file. Start the crontab editor from a terminal window:
$crontab -e

# Commands that normally run with administrative privileges (i.e. they are 
# generally run using sudo) should be added to the root user's crontab (instead of the user's crontab):
$sudo crontab -e

# see:
# https://help.ubuntu.com/community/CronHowto

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dd if=/dev/sdb of=imagem.img bs=1MB

of = output
if = input
bs = Block Size

example (tested):

# to make an image
sudo dd if=/dev/mmcblk0 of=~/Desktop/image.iso bs=1MB

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Map modelMap = model.asMap();
for (Object modelKey : modelMap.keySet()) {
    Object modelValue = modelMap.get(modelKey);
    System.out.println(modelKey + " -- " + modelValue);
}

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mvn org.glassfish:maven-glassfish-plugin:run